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dc.contributor.convenorA/Professor Felix Chanen_US
dc.contributor.authorRichards, Russellen_US
dc.contributor.authorMullins, Benen_US
dc.contributor.editorChan, F., Marinova, D. and Anderssen, R.Sen_US
dc.date.accessioned2017-05-03T12:51:26Z
dc.date.available2017-05-03T12:51:26Z
dc.date.issued2011en_US
dc.date.modified2012-08-27T11:50:18Z
dc.identifier.refuriwww.mssanz.org.au/modsim2011/en_US
dc.identifier.urihttp://hdl.handle.net/10072/43569
dc.description.abstractThe remediation of leachate from (municipal) landfills is becoming an increasing challenge for many government authorities. There is mounting interest in using bioremediation as a means of stripping these contaminants from the leachate and concentrating it within biological material, typically microalgae. Additionally, there is significant interest in the production of lipids from waste streams using microalgae. Landfill leachate typically hosts a suite of inorganic contaminants and therefore it is of great interest to evaluate the ability of different microalgae to (1) survive, (2) grow and (3) accumulate a range of heavy metals under field conditions. While this provides realism, it does however, require a firm understanding of how the interacting biology and chemistry of the microalgae and leachate constituents interact including the potential for feedback loops, delays and nonlinear functional relationships. To this end, we propose the use of a system dynamics modelling framework to develop a 'stock' (reservoirs) and 'flow' system dynamics model that explores the algae growth dynamics and the heavy metal adsorption kinetics simultaneously. We have developed a model that mimics the temporal evolution of metal removal from a leachate into a biological mixture comprising of four common marine microalgae species- Nanochloropsis, Pavlova lutheri, Tetraselmis chuii and Chaetoceros muelleri. The growth dynamics of the microalgae species is modelled using four separate stocks that represent the concentration of each of the four species with inputs and outputs consisting of growth and mortality respectively. Growth is light-limited while both growth and mortality are assumed to be temperature dependent. Similarly, the five metals monitored in the leachate (iron, manganese, barium, cerium and lanthanum) are each represented by a stock. The uptake kinetics of the metals (removal from the leachate) are modelled using adsorption kinetics, taking into account that there are a finite amount of adsorption sites on the microalgae. The model is primarily parameterised from data obtained through pilot studies using the four marine microalgal species. Two photobioreactors employing light regimes, mixing and aeration were dosed with landfill leachate and simultaneously seeded with the four microalgal species and left for three days. The leachate and the microalgae species were analysed for metal content at the beginning and end of the batch experiment. The use of two reactors and subsequent two sets of results allowing the microalgae growth kinetics (growth and mortality) to be simultaneously fitted to the data. It is assumed that any potential effects of leachate toxicity on microalgae growth dynamics will be implicitly included in the respective growth and mortality rate constants. Overall, this system dynamics model provides a mechanism for understanding and predicting the bioremediating ability of different algae under realistic conditions.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_US
dc.format.extent1346641 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_US
dc.publisherModelling and Simulation Society of Australia and New Zealanden_US
dc.publisher.placeAustraliaen_US
dc.publisher.urihttp://www.mssanz.org.au/modsim2011/en_US
dc.relation.ispartofstudentpublicationNen_US
dc.relation.ispartofconferencename19th International Congress on Modelling and Simulation (MODSIM 2011)en_US
dc.relation.ispartofconferencetitleMODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2011en_US
dc.relation.ispartofdatefrom2011-12-12en_US
dc.relation.ispartofdateto2011-12-16en_US
dc.relation.ispartoflocationPerth, Australiaen_US
dc.rights.retentionYen_US
dc.subject.fieldofresearchEnvironmental Managementen_US
dc.subject.fieldofresearchEnvironmental Monitoringen_US
dc.subject.fieldofresearchDynamical Systems in Applicationsen_US
dc.subject.fieldofresearchcode050205en_US
dc.subject.fieldofresearchcode050206en_US
dc.subject.fieldofresearchcode010204en_US
dc.titleModelling the kinetics of leachate remediation using microalgaeen_US
dc.typeConference outputen_US
dc.type.descriptionE1 - Conference Publications (HERDC)en_US
dc.type.codeE - Conference Publicationsen_US
gro.facultyGriffith Sciences, Griffith School of Environmenten_US
gro.rights.copyright© 2011 Modellling & Simulation Society of Australia & New Zealand. The attached file is reproduced here in accordance with the copyright policy of the publisher. For information about this conference please refer to the conference’s website or contact the authors.en_US
gro.date.issued2011
gro.hasfulltextFull Text


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